Abstract
In this article, the effect of composition on magnetoelectric properties of lead-free (x) [0.5BZT – 0.5BCT] – (100-x) NiFe2O4 (x=90, 80, 70wt%) particulate composites synthesized by sol-gel method was studied. Presence of ferroelectric and ferromagnetic phases in the composites was confirmed using x-ray diffraction technique. The microstructure of the composites displayed uniform grains distribution and dispersion of NFO phase in BCZT matrix. The co-existence of ferroelectric and magnetic orderings at room temperature was confirmed by measuring the P-E and M-H loops respectively, of the particulate composites. Frequency dependence of admittance measurements exhibited high electro-mechanical coupling coefficient (kp) in the range of 0.41 to 0.37. The magneto-electric (ME) properties of the composites were studied both in longitudinal (αE,33) and transverse (αE,31) modes at low frequency of 1kHz under external bias field (Hdc). High strain mediated ME coupling responses, αE,31=13.3mV/cmOe, 8mV/cmOe and 4.3mV/cmOe were recorded for samples with x=80, 90, and 70wt% BCZT respectively.
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